mirror of
https://github.com/postgres/postgres.git
synced 2025-10-31 10:30:33 +03:00
57e3c5160b
Adds bool opclass to btree_gist extension, to allow creating GiST indexes on bool columns. GiST indexes on a single bool column don't seem particularly useful, but this allows defining exclusion constraings involving a bool column, for example. Author: Emre Hasegeli Reviewed-by: Andrey Borodin Discussion: https://postgr.es/m/CAE2gYzyDKJBZngssR84VGZEN=Ux=V9FV23QfPgo+7-yYnKKg4g@mail.gmail.com
97 lines
1.5 KiB
Plaintext
97 lines
1.5 KiB
Plaintext
-- bool check
|
|
CREATE TABLE booltmp (a bool);
|
|
INSERT INTO booltmp VALUES (false), (true);
|
|
SET enable_seqscan=on;
|
|
SELECT count(*) FROM booltmp WHERE a < true;
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM booltmp WHERE a <= true;
|
|
count
|
|
-------
|
|
2
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM booltmp WHERE a = true;
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM booltmp WHERE a >= true;
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM booltmp WHERE a > true;
|
|
count
|
|
-------
|
|
0
|
|
(1 row)
|
|
|
|
CREATE INDEX boolidx ON booltmp USING gist ( a );
|
|
SET enable_seqscan=off;
|
|
SELECT count(*) FROM booltmp WHERE a < true;
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM booltmp WHERE a <= true;
|
|
count
|
|
-------
|
|
2
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM booltmp WHERE a = true;
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM booltmp WHERE a >= true;
|
|
count
|
|
-------
|
|
1
|
|
(1 row)
|
|
|
|
SELECT count(*) FROM booltmp WHERE a > true;
|
|
count
|
|
-------
|
|
0
|
|
(1 row)
|
|
|
|
-- Test index-only scans
|
|
SET enable_bitmapscan=off;
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT * FROM booltmp WHERE a;
|
|
QUERY PLAN
|
|
------------------------------------------
|
|
Index Only Scan using boolidx on booltmp
|
|
Filter: a
|
|
(2 rows)
|
|
|
|
SELECT * FROM booltmp WHERE a;
|
|
a
|
|
---
|
|
t
|
|
(1 row)
|
|
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT * FROM booltmp WHERE NOT a;
|
|
QUERY PLAN
|
|
------------------------------------------
|
|
Index Only Scan using boolidx on booltmp
|
|
Filter: (NOT a)
|
|
(2 rows)
|
|
|
|
SELECT * FROM booltmp WHERE NOT a;
|
|
a
|
|
---
|
|
f
|
|
(1 row)
|
|
|